I read on some grooming forums that you can put some conditioner in a spray bottle and mix with water to use to spray down the fur before combing out and it helps alot. I haven't tried it yet, but they say it makes it easier to comb out without breaking or pulling the fur.

I have a cairn terrier, and I use Pet Silk (out of Houston, TX) oatmeal shampoo. I do not bother with a conditioner. The shampoo is gentle and smells so good. I can use it as frequently as needed and it does not irritate his skin. Pet Silk also has conditioners and other kinds of shampoo. I get it at a kennel and at Petsmart.